Planetary gearing



Sept. 9, 1952 C. c. MARTIN ETAL PLANETARY GEARING Filed Jan. 50, 1951 INVENTORS. CHARLES C. MARTIN DAV\D A. Rouw n A'rv'Y Patented Sept. 9, 1952 d g PLANETARY GEAniNG Charles C. Martin and David A. Round, Cleve- 'UNITED' STATES PATENTAFFI'CE. N

land, Ohio, assignors to David Round I Cleveland, Ohio, a firm A A `Application January 30, 1951, Serial No. 208,594 I claims. (c1. rfi-sos) This invention relates to hoists. I

It is an object of Vthis invention to provide hoists which shall possess greater efficiency than hoists heretofore known.

A further object is toprovide hoists which shall be smoother and substantially silent in operation. Y Y Y I A further object is to provide hoists which shall be more economical to produce.

A further object is to provide hoists which shall embody simpler and fewer parts.

A further object is to provide hoists which shall be lighter in weight.

A further object is to provide hoists which shall be of smaller size and more compact.

A further object is to provide hoists which shall obviate precision shop operations.

A further object is to4 provide hoists in which wear shall be substantially reduced.

A further object is to provide hoists which shall be so constructed that the means employedv to impart eccentric motion to certain gears of the hoists shall also prevent rotation of such gears. I

A further object is to provide hoists which shall embody `a direct drive connection between the driving or power shafts of the hoists and the means which prevent rotation of eccentrically actuated gears utilized in the hoists.

Other objectsA of the invention will become clear as the description thereof proceeds.

In the drawings formingpart of this specification: L Fig. 1 is an end view of a hoist embodying the instant invention. I I

Fig. 2 is a vertical section taken on line 2-2 of Fig. 1.

Fig. 3 is a vertical section taken on line 3`3 of Fig. 2.

A hoist including our invention and illus-I' trated in the accompanying drawing embodies a housing member I0 which preferably, although not necessarily, embodies three sections II, I2 and I3 releasably secured together in any desired manner. The housing section II embodies a recess I4 provided with a ball bearing I5 within which one end of a driving or power shaft I6 is journalled. The shaft I6 extends through an opening I8 formed in the intermediate housing section I2. The driving shaft I6 projects through an opening I9 formed in the housing section I3 and adjacent to said opening is journalled in a needle bearing 20 disposed within the hub 2I of an internal gear 22 hereinafter described. The driving shaft I6 is concentric and & Son,"

hasmounted :thereon .between the housing sections II and I2 a gear 23 rotatable with the shaft. Y

The housingv section II- is formedV with additional recesses 24 and 25 disposed respectively above and below the recess I4. IOne end of a driven shaft 26 is journalled withina needle bearing 21 lying in the recess 24. "The shaft 26 is also journalled, in a `needle bearing 28 disposed within4 an opening 29 of the intermediate housing section I2. The portion 30 of the shaft 26 which lies to the left of the needle bearing 28 as viewed in Fig. 2 of the drawings is arranged in eccentric relationship with respect to the remainder of the shaft. A gear 3I is mounted` upon the shaft 26 between the housing sec-` tions II and I2 forV rotation with the shaft and in mesh with the gear 23 mounted upon the driving Shaft I6.

Similarly, a driven shaft32 is journalled in a lneedle bearing 33 lying-within recess 25 of the housing section II. AThe driven shaft 32 is also journalled in a needle Lbearing 34 disposed Within an opening 35v in the intermediate housing section I2. To the left of thelatter bearing as viewed in Fig..2 of the drawings the shaft 32 is provided'with an eccentric portion 36. A gear 3l is mounted upon the driven shaft 32 between the housing sections II and. I2 for rotation with said shaft'andjnmeshwith the gear 23 mounted upon the driving shaft |16. 'I

An external gear 38 is mounted` upon the eccentric portions 30 and 36 of the driven shafts 26 and 32. For this purpose the eccentric portions 30 and 36 extend through openings 39 and 40 in the external gear 38 and needle bearings 4I and 42 serve to journal' the eccentric portions 30 and 36 in these openings. The external gear 33 is also formed with an opening 43 which is eccentric relative tothe driving shaft I6 and is of larger diameter than said shaft.

TheA external gear 38 is in mesh with the internal gear 22 as illustrated more clearly in Fig. 3 of the drawing. As noted hereinabove the internal gear 22 carries the hub 2i supported upon the needle bearing 26. The internal gear 22 is further supported anti-frictionally by means of the bearings 44 and 45. The customary load wheel 46 is secured upon the hub 2I of the internal gear 22 as by means of keys 4l and 48 so as to rotate with the internal gear. As is well known, the load wheel 46 carries the usual chain (not shown) by which a load is carried.

When the drive shaft I6 is rotated as by means 3 of the usual sprocket and drive chain (not shown), or in any other desired manner, rotation is imparted to the gear 23 mounted upon the drive shaft. Since this gear is in mesh with the gears 3| and 31 mounted respectively upon the driven shafts 26 and 32. rotation is alsoimparted to the latter shafts. e During such rotation the eccentric portions 3D and 3 of the driven shafts impart an eccentric motion to the external gear 38 mounted thereon while at the same time prevent- DuringitsA ing rotation of the external gear. eccentric motion successive meshing of certain of the teeth of the external andfinternalfgears ocj eccentric Yportions and having an opening of Y greater diameter than said driving shaft through Y which saiddriving shaft extends, and a gear curs whereby rotation is imparted tothe internal gear and to the load wheel mounted thereon in order to lift the load carried; by,the,-l;-.W1,1ee1;-:;

Eccentric movement of the external geari is obe vmountedin-saidlliciusing member and meshing withfsaidigarlmounted on said eccentric portions. 3..In.a-h oist, a housing member, a driving shaft journaflled Vin said housing member, driven shafts tained without interference from the# driving shaft I6l by reason of the eccentric opening in the Ygear throughwh-ich the drivingl shaft extends. In `the illustrated embodiment. of ourk iii-ven- Vtion, the external gear is provided with 33 .teeth andthe internal gear-withll2\teethrv It .will be understood, however, that our invention. isnot limited to this particular \gear.ratio..butthat otherA gear ratios ina-ybe employed. as well.

Byvirtue-of our invention `positive drivingcontrolfofthe externalgear and .controlled relations. shipbetween the external-and internalV gear-s are established-.v Thefsame-=means which imparts eccentriclmotionto the external, gear serves :also to preventrotationofsuch gear. smoother and noiselessoperation together with .7.a reduction in wearing friction are obtained 'Iheemployment I of simplerparts-has obviatediprecision shop oper-` ationswand eliminated the..need .forrrexpensive toolsrequiredi-to perform: such-..operations., Airef duction in the number of parts requiredhasbeen achieved resulting in a lighter, more compact Yand economical hoist than hasheretofore beenknown. Moreoventhese salutary. results have v`been ac-4 complished-while attaining asubstantial .increase of eiciency-of approximately `seven percent.

vIt will be apparent thatznumerous kchangesiand modifications in the details of the inventionwill be clear to thoseskilledinzthe art.,A It is intended, therefore,L that all x such modifications. and changes vbe comprehended .within Athis invention which is to be. limited. onlyxbyv fthe; scope of :the claims appended. hereto.:

1..: In a hoist; a :housing 1 mem-ber;v a ldrivingy shaft VjournalledV in said housing member, ,driven shafts4 journalled` y in z said 'housing member` and having: eccentric, portions, gears-,mounted ,upon

ysaid driving and driven. shaftsforrotation therewith, said gears. ,on.said. driven; shafts meshing with lsaid gear-on said driving shaft, an Yexternal gear mounted onsaid eccentric portions and having an opening ofgreater diameter than said driving shaftthrough whichsaid driving shaft extends, an internal. gear mounted in said housandjan ,internalggear mount journalled in said housing member and having eccentric portions, drivingconnections between said driving andzdriye mounted on saidecce Opening of-ereate. shaft through which said memberv andv mesbirleiwiibisald- @Xterilel :eerl

4. In a hoist, a housingmernber, a concentiric` tions betweensa ,y A external gear, munies Qn saisies-genti?, soutiens and having an opening-eccentricewith Llandgof larger diameter-themen drivingShaft-through' f which saidLdrivingshaft-extends, landan internal.A

gear rotatably fmmmidzinrld.huSreimsmber and meshing'withsaidexternalfgean Y s ifa.- Qilsine m. mberee--eencentrie driving shaftjou alled e h" A' f apail 0f ldriven:shafts journalled Iin said lhousing member onoppsite sides;V of saidV drivingA shaft portions Y., driving A.connecand ,having Vecentrl d e tions betweenesaidkdriving andfdriven shafts, an external gear mounted on said eccentric portions and having4 tn-opening eccentric. withv and4 of larger diametenthan {said drivingfshaft; through REFEENCES" CITED" .Thezfollowing referencesare sof; .record` in the nie of this patent:

UNITED STATESPATENTS d houeieei'iember.

riven haii-iv an ft extends, and anv internal 

